Callaway Men's Big Bertha 816 Double Black Diamond Driver Extreme distance from Dual distance chambers: if you want a neutral or draw ball flight to work the ball with more Control, pick the left or right chamber; Then set the gravity core up or down depending on where you hit the ball for max ball speed Next Gen R moto technology: to get every last yard out of your driver, you need more speed; That's why we put in our next generation R moto technology; It provides a thinner Face, leading to higher ball speeds on center hits and off-center hits too A deeper Face, traditional shape and a low center of gravity: the best players want/need all of these characteristics in a driver in order to reduce spin and maximize Control and forgiveness; And that's exactly what we're giving them with this driver Optifit Adjustability tune the driver to the settings you want to play with our 8-way Adjustability; You can add loft, take loft off or adjust the lie angle to fit your swing